Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Ashwagandha (KSM-66) | L-Theanine | |
|---|---|---|
| Category | Adaptogens | Amino Acids |
| Standard Dose | 600mg KSM-66 daily (300mg 2x/day) | 100-200mg daily (or as needed for acute anxiety/focus) |
| Timing | Morning and evening with meals. Evening dose supports sleep quality via cortisol reduction. | Flexible: morning for calm focus (stack with caffeine), before stressful events, or evening for relaxation/sleep onset. Onset: 30-60 minutes oral, 15-20 min sublingual. |
| Cycle Duration | Cycle 8-12 weeks on, 2-4 weeks off (to prevent adaptogenic tolerance) | ongoing or as needed |
| Evidence Level | strong_human | strong_human |
Ashwagandha's primary bioactives are withanolides (particularly withaferin A and withanolide D). KSM-66 is a full-spectrum root extract standardized to >5% withanolides. It modulates the HPA axis by reducing cortisol output (20-30% reduction in trials), likely through GABAergic activity (withanolides are GABA-mimetic at GABA-A receptors) and by normalizing cortisol receptor (GR) sensitivity. It also inhibits the NMDA-induced neurotoxicity pathway, enhances DHEA-S production, promotes thyroid function (increases T4 to T3 conversion), upregulates antioxidant enzymes (SOD, catalase, glutathione peroxidase), and has demonstrated sirtuin-activating properties.
600mg KSM-66 daily (300mg 2x/day)
Morning and evening with meals. Evening dose supports sleep quality via cortisol reduction.
Cycle 8-12 weeks on, 2-4 weeks off (to prevent adaptogenic tolerance)
L-Theanine (gamma-glutamylethylamide) crosses the blood-brain barrier via the large neutral amino acid transporter. It increases alpha brain wave activity (8-13 Hz, associated with relaxed alertness), enhances GABA, serotonin, and dopamine levels in the brain, and antagonizes glutamate excitotoxicity by blocking glutamate binding at AMPA, kainate, and NMDA receptors. It also increases BDNF and NGF expression, supporting neuroplasticity. The combination of glutamate antagonism and GABA/serotonin enhancement produces anxiolysis without sedation — a 'calm focus' state.
100-200mg daily (or as needed for acute anxiety/focus)
Flexible: morning for calm focus (stack with caffeine), before stressful events, or evening for relaxation/sleep onset. Onset: 30-60 minutes oral, 15-20 min sublingual.
ongoing or as needed
Take our free assessment to get personalized recommendations based on your health goals, current stack, and biomarkers.
Get Your Free Protocol →or take the assessment →